Community acquired pneumonia remains an important cause of hospital admission and caries appreciable mortality and morbidity. The purpose of this study was to assess the causes of community-acquired pneumo­nia in adult patients admitted to hospital in our region. Sixty-eight patients with community acquired pneumo­nia requiring hospitalization were studied prospectively from march 1999 to may 1999. The aetiology of com­munity acquired pneumonia was identified in 31 patients (% 45.5). The diagnosis of bacterial pathogens was based on positive blood cultures, sputum / bronchial aspiration fluid Grams stain and culture and positive se­rological tests. The distribution of causal agents was as follows: S. pneumoniae (% 44.2), aerobic Gram-nega­tive bacilli (% 23.3), M. pneumoniae (% 16.3), C. pneumoniae (% 9.3), Legionella pneumophila (% 7). The most common predisposing factor was chronic obstructive lung disease in entire group. Our most important result is the finding of multiple or mixed pathogens in 11 patients, representing 35.5 % of patients with de­finitive causal diagnosis. We think that empirical antibiotic therapy for community-acquired pneumonia sho­uld be comprise Gram-negative spectrum and agents of atypical pneumonia in our region.